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      1 /*
      2  * COPYRIGHT AND PERMISSION NOTICE
      3  *
      4  * Copyright (c) 2003 Embedded Unit Project
      5  *
      6  * All rights reserved.
      7  *
      8  * Permission is hereby granted, free of charge, to any person obtaining
      9  * a copy of this software and associated documentation files (the
     10  * "Software"), to deal in the Software without restriction, including
     11  * without limitation the rights to use, copy, modify, merge, publish,
     12  * distribute, and/or sell copies of the Software, and to permit persons
     13  * to whom the Software is furnished to do so, provided that the above
     14  * copyright notice(s) and this permission notice appear in all copies
     15  * of the Software and that both the above copyright notice(s) and this
     16  * permission notice appear in supporting documentation.
     17  *
     18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
     19  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
     21  * OF THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
     22  * HOLDERS INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY
     23  * SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER
     24  * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
     25  * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
     26  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
     27  *
     28  * Except as contained in this notice, the name of a copyright holder
     29  * shall not be used in advertising or otherwise to promote the sale,
     30  * use or other dealings in this Software without prior written
     31  * authorization of the copyright holder.
     32  *
     33  * $Id: stdImpl.c,v 1.3 2004/02/10 16:15:25 arms22 Exp $
     34  */
     35 #include "stdImpl.h"
     36 
     37 char* stdimpl_strcpy(char *dst, const char *src)
     38 {
     39 	char *start = dst;
     40 	char c;
     41 	do {
     42 		c = *src;
     43 		*dst = c;
     44 		src++;
     45 		dst++;
     46 	} while (c);
     47 	return start;
     48 }
     49 
     50 char* stdimpl_strcat(char *dst, const char *src)
     51 {
     52 	char *start = dst;
     53 	char c;
     54 	do {
     55 		c = *dst;
     56 		dst++;
     57 	} while (c);
     58 	dst--;
     59 	do {
     60 		c = *src;
     61 		*dst = c;
     62 		src++;
     63 		dst++;
     64 	} while (c);
     65 	return start;
     66 }
     67 
     68 char* stdimpl_strncat(char *dst, const char *src,unsigned int count)
     69 {
     70 	char *start = dst;
     71 	char c;
     72 	do {
     73 		c = *dst;
     74 		dst++;
     75 	} while (c);
     76 	dst--;
     77 	if (count) {
     78 		do {
     79 			c = *src;
     80 			*dst = c;
     81 			src++;
     82 			dst++;
     83 			count--;
     84 		} while (c && count);
     85 		*dst = '\0';
     86 	}
     87 	return start;
     88 }
     89 
     90 int stdimpl_strlen(const char *str)
     91 {
     92     const char *estr = str;
     93 	char c;
     94 	do {
     95 		c = *estr;
     96 		estr++;
     97 	} while (c);
     98     return ((int)(estr - str - 1));
     99 }
    100 
    101 int stdimpl_strcmp(const char *s1, const char *s2)
    102 {
    103 	char c1,c2;
    104 	do {
    105 		c1 = *s1++;
    106 		c2 = *s2++;
    107 	} while ((c1) && (c2) && (c1==c2));
    108 	return c1 - c2;
    109 }
    110 
    111 static char* _xtoa(unsigned long v,char *string, int r, int is_neg)
    112 {
    113 	char *start = string;
    114 	char buf[33],*p;
    115 
    116 	p = buf;
    117 
    118 	do {
    119 		*p++ = "0123456789abcdef"[(v % r) & 0xf];
    120 	} while (v /= r);
    121 
    122 	if (is_neg) {
    123 		*p++ = '-';
    124 	}
    125 
    126 	do {
    127 		*string++ = *--p;
    128 	} while (buf != p);
    129 
    130 	*string = '\0';
    131 
    132 	return start;
    133 }
    134 
    135 char* stdimpl_itoa(int v,char *string,int r)
    136 {
    137     if ((r == 10) && (v < 0)) {
    138 		return _xtoa((unsigned long)(-v), string, r, 1);
    139 	}
    140 	return _xtoa((unsigned long)(v), string, r, 0);
    141 }
    142